Ảnh hưởng của hàm lượng DHA làm giàu luân trùng (Brachionus plicatils) và artemia (Artemia franciscana) lên tăng trưởng, biến thái và tỷ lệ sống của ấu trùng của cá khoang cổ cam (Amphiprion percula Lacepède, 1802)

Abstract

     DHA and other polyunsaturated fatty acids play an important role in improving the larval performance of marine finfish in general. In the present study, different concentrations of livefeed - enriched DHA (50, 100, 150 and 200 mg/liter and control, 0 mg/liter) were tested to evaluate the effect of this ingredient on growth, survival and metamorphosis of orange clownfish larvae. Larvae were reared in 30-liter glass tanks at a density of 1 fish/1.5 liters of water. Larvae were fed livefeed - enriched with DHA (A1 DHA Selco), consisting of rotifers (first 3 days) and metanauplius Artemia (from day 2 onwards). All treatements were conducted with three replicates for a period of 45 days. The study results showed that the enrichment of livefeed with DHA at any concentration (50 - 200 mg/liter) significantly improved the growth, survival and metamorphosis rates of orange clownfish larvae compared with the control (P < 0.05). In which, the supplement content of 150 mg/liter was determined to be optimal for this fish. Increasing the concentration to 200 mg/liter not only did not improve but also reduced the rearing results compared to the level of 150 mg/liter. From this study, it can be concluded that orange clownfish larvae should be fed livefeed - enriched DHA at the concentration of 150 mg/liter to achieve optimal growth, survival and metamorphosis rates.